lib: fs: add library for implementing a filesystem service

lib/libfs/interface.h

@@ -0,0 +1,21 @@
+#ifndef _FS_INTERFACE_H_
+#define _FS_INTERFACE_H_
+
+#include <mango/types.h>
+
+struct msg_endpoint;
+
+extern kern_status_t fs_msg_open(
+	const struct msg_endpoint *sender,
+	const char *path,
+	int flags,
+	int *out_err,
+	void *arg);
+extern kern_status_t fs_msg_close(
+	const struct msg_endpoint *sender,
+	const char *path,
+	int flags,
+	int *out_err,
+	void *arg);
+
+#endif